What happens in other browsers?

Safari and Opera behave the same, Firefox does not support the image-set property yet that is needed to define different cursor versions depending on the display resolution.

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"Safari and Opera behave the same"

We use the system APIs to create cursors, and so if Safari behaves the same then the issue lies with the screenshotting. What do you use to create screenshots?

I can reproduce the issue by using either the Cmd + Shift + 3 shortcut, the 'Take Screenshot' command of Apple Preview, or screencast software like Camtasia.

It seems to me that the problem is with the screenshot APIs.

Safari and we set cursors via our cursor API, and they display as intended. So the cursor setting APIs are good.

All the screenshot software, both first- and third-party, incorrectly shows cursors. Either they're all incorrectly using their APIs (unlikely) or the APIs to get the full cursor information don't exist.

My recommendations would be to:

1. File a bug with Apple (bugreport.apple.com) to let them know about the issue with Command-Shift-3.
2. Email Camtasia. They would know exactly what APIs they're relying on, and if the APIs aren't producing the correct result (as you note they are not) then they can also file bugs with Apple with technical detail.

There is nothing we can do on our end. We're setting the cursors as correctly as we can.

Thank you for looking into this and pointing me in the right direction.